Przeglądaj {{ collection }} wg Autor "Sykuła, Anna"

Teraz wyświetlane 1 - 10 z 10

Antioxidant properties of Moringa oleifera and Withania somnifera extracts and their use in cosmetics for men
(Wydawnictwo Politechniki Łódzkiej, 2023) Jezierska, Adrianna; Sykuła, Anna
Nowadays, men are paying more and more attention to their appearance, and thus try to provide their skin with proper care so that it looks healthy and without signs of aging. In the present study, ashwagandha (Withania somnifera) and moringa oleifera (Moringa oleifera) were selected from the most popular adaptogens used in cosmetics, which are currently not commonly used in cosmetic preparations for men. The selected adaptogens were compared for their phytochemical and antioxidant properties to determine their skin care effects in cosmetics. The phytochemical content was evaluated through the determination of total phenolic content and in vitro antioxidant capacity was determined by DPPH (2,2-diphenyl-1-picrylhydrazyl) and ABTS{2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)} free radical scavenging tests. The total phenolic contents 1.81±0.13 and 0.14±0.02 mg GAE/g extract were found to be present in Moringa oleifera and Withania somnifera glycol-water extracts, respectively. Among the two chosen extracts, Moringa oleifera exhibited significant free radical scavenging activity, ABTS (0.964 ± 0.021 mg TE/g extract) and DPPH (0.822 ± 0.004 mg TE/g extract). It can be concluded that Moringa oleifera extract has strong antioxidant properties than Withania somnifera extract.
Application and properties of selected flavanones
(Wydawnictwo Politechniki Łódzkiej, 2018) Błazińska, Paulina; Sykuła, Anna
Flavanones, secondary plant metabolites, are one of the main group of flavanoids. They are widely spread in nature in many plants. The large diversity of structural structure of flavanones and controlled methods of modifying their molecules have a huge impact on biological activity. The present review will summarize the current knowledge about occurrence, obtaining by chemical synthesis, application and bioactivity of flavanones. Also, they are received from specific chemical synthesis. Flavanones have a great biological activity. Derivatives of flavanone have many different properties such as anti-inflammatory, anticancer, antioxidant, antimicrobial or hepatoprotective activities. These natural polyphenolic compounds are used in cosmetology, pharmacy and medicine. The demand and usage on them increases.
Chromium in food products
(Wydawnictwo Politechniki Łódzkiej, 2012) Sykuła, Anna; Pawlak, Anna
Chromium plays an important role in human and animal bodies. According to the oxidation state chromium can be advantageous for human health and, simultaneously possesses toxic properties. In this work the studies concerning the chromium content in the total and Cr (VI) forms in selected and frequently used during breakfast food products were presented. The largest quantities of the metal occur in raw cereal products (non-roasted buckwheat or brown rice bread) and herbs such as garlic or mint. The lowest chromium contents were observed in raw and UHT milk samples.
Determination of chromium in cocoa products
(Wydawnictwo Politechniki Łódzkiej, 2009) Turek, Monika; Sykuła, Anna; Jabłońska, Aneta; Pilo, Maria Itria; Noce, Antonia; Spanu, Francesco
Tematyka tej pracy koncentruje się głównie na właściwościach fizyko-chemicznych chromu, toksyczności oraz jego zawartości w kakao. Została opisana również krótka historia odkrycia ziaren kakao i ich właściwości. Wykonano również oznaczanie chromu w spożywczych produktach kakaowych za pomocą spektroskopii UV-VIS metodą z difenylokarbazydem (DFK). Przeprowadzono pomiar 14 różnych próbek kakao, które wcześniej poddano mineralizacji.
Determination of nickel in tea by using dimethylglyoxime method
(Wydawnictwo Politechniki Łódzkiej, 2010) Sykuła, Anna; Turek, Monika; Mohit, Philip Mathew; Patai, Ferenc; Horvat, Martina; Jabłońska, Joanna
Tea is one of the most popular beverages in the world. Recent studies have shown that it contains concentrations of heavy metals such as nickel. Heavy metals are known to be toxic and there have been many studies on their toxicity such as lead and cadmium, however researchers are now starting to explore the nature of the toxicity of nickel. A common and well-known method of spectrophotometric determination of nickel by dimethylglyoxime reagent was used. The presented paper, due to the increasing concerns surrounding the harmful effects of nickel compounds, aims at testing and demonstration of the effectiveness of the mentioned method.
Determination of total contents of transition metals in selected granular black teas marketed in Poland
(Wydawnictwa Politechniki Łódzkiej, 2014) Sykuła, Anna; Brodowska, Katarzyna; Więdłocha, Marzenna
The total contents of metals in three granulated black tea samples marketed in Poland were determined. Four elements consisting transition metals (Ni, Cu, Zn and Fe) were analyzed using flame atomic absorption spectrophotometry (FAAS). All examined tea brands contain considerable contents of the studied transition metals. Among the tested transition metals Fe (242-589 mg kg-1) was the most abundant one in the granular black tea imported from India. The highest value of Fe was analyzed in the cheapest tea, the smallest in the most expensive. The other metals are less abundant than Fe, their values varied from 8.50-8.90 for Ni, 7.80-10.4 for Cu and 8.13-12.6 for Zn mg kg-1. The accuracy of the proposed method was assessed by determining the recovery of metals from analyzed tea samples using the standard addition method. Recovery assays of nickel, copper, zinc and iron were demonstrated satisfactory, mean recoveries 99.29, 100.31, 99.94 and 99.79 %, respectively.
Determination of total contents of transition metals in selected granular black teas marketed in Poland
(Wydawnictwo Politechniki Łódzkiej, 2014) Sykuła, Anna; Brodowska, Katarzyna; Więdłocha, Marzenna
The total contents of metals in three granulated black tea samples marketed in Poland were determined. Four elements consisting transition metals (Ni, Cu, Zn and Fe) were analyzed using flame atomic absorption spectrophotometry (FAAS). All examined tea brands contain considerable contents of the studied transition metals. Among the tested transition metals Fe (242-589 mg kg-1) was the most abundant one in the granular black tea imported from India. The highest value of Fe was analyzed in the cheapest tea, the smallest in the most expensive. The other metals are less abundant than Fe, their values varied from 8.50-8.90 for Ni, 7.80-10.4 for Cu and 8.13-12.6 for Zn mg kg-1. The accuracy of the proposed method was assessed by determining the recovery of metals from analyzed tea samples using the standard addition method. Recovery assays of nickel, copper, zinc and iron were demonstrated satisfactory, mean recoveries 99.29, 100.31, 99.94 and 99.79 %, respectively.
In vitro study of hesperetin Schiff bases antioxidant activity on rat liver mitochondria
(Wydawnictwo Politechniki Łódzkiej, 2018) Sykuła, Anna; Cheshchevik, Vitali T.; Cheshchevik, Nina G.; Dzeikala, Aliaksandr; Łodyga-Chruścińska, Elżbieta
Three hesperetin Schiff bases: hesperetin thiosemicarbazone (HTSC), hesperetin isoniazone (HIN) and hesperetin benzhydrazone (HHSB) have been synthesized and characterized by using analytical and spectral techniques. The influence of substituents on hesperetin antioxidant activity has been studied in vitro using mitochondrial assays. The studied compounds have been found to exhibit both antioxidant and pro-oxidant activity.
Polimorfizm - jego wpływ na substancje farmaceutyczne
(Wydawnictwo Politechniki Łódzkiej, 2006) Sykuła, Anna; Łodyga-Chruścińska, Elżbieta; Zakrzewski, Marek
Polimorfizm jest obecnie ważnym zjawiskiem w dziedzinie farmacji. Istnieje wiele substancji farmaceutycznych wykazujących zjawisko polimorfizmu bądź pseudopolimorfizmu. Wiele farmaceutyków może posiadać różne struktury krystaliczne, co ma istotny wpływ na właściwości postaci leku. W tym celu wykonuje się różnorodne analizy odmian polimorficznych. W oparciu o dane literaturowe przedstawiono przekrojowy opis możliwych struktur krystalicznych, ich właściwości, zależności między strukturą a właściwościami oraz najważniejsze techniki badań odmian polimorficznych różnych leków (m.in. metody rentgenowskiej analizy dyfrakcyjnej, metody spektroskopowe, metody termiczne).
Zastosowanie spektrofotometrii UV-VIS do oznaczenia rozpuszczalności chlorowodorku bupiwakainy
(Wydawnictwo Politechniki Łódzkiej, 2009) Sykuła, Anna; Zdziarska, Paulina
W celu wstępnego zbadania rozpuszczalności i ogólnego zachowania się chlorowodorku bupiwakainy, leku znieczulającego miejscowo, w różnych rozpuszczalnikach oraz w środowiskach o różnym pH i przy zmiennych stężeniach wykorzystano spektroskopię UV-Vis. W literaturze światowej, jak i polskiej znajduje się niewiele informacji dotyczących tego typu badań, dlatego też wyniki uzyskane w tej pracy stanowią pewne uzupełnienie stanu wiedzy w tym zakresie.